Documentation/accounting/getdelays.c - android_kernel_htc_msm8960 - Gitiles

 /* getdelays.c
  *
  * Utility to get per-pid and per-tgid delay accounting statistics
  * Also illustrates usage of the taskstats interface
  *
  * Copyright (C) Shailabh Nagar, IBM Corp. 2005
  * Copyright (C) Balbir Singh, IBM Corp. 2006
  * Copyright (c) Jay Lan, SGI. 2006
  *
  * Compile with
  *	gcc -I/usr/src/linux/include getdelays.c -o getdelays
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <unistd.h>
 #include <poll.h>
 #include <string.h>
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <signal.h>

 #include <linux/genetlink.h>
 #include <linux/taskstats.h>
 #include <linux/cgroupstats.h>

 /*
  * Generic macros for dealing with netlink sockets. Might be duplicated
  * elsewhere. It is recommended that commercial grade applications use
  * libnl or libnetlink and use the interfaces provided by the library
  */
 #define GENLMSG_DATA(glh)	((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
 #define GENLMSG_PAYLOAD(glh)	(NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
 #define NLA_DATA(na)		((void *)((char*)(na) + NLA_HDRLEN))
 #define NLA_PAYLOAD(len)	(len - NLA_HDRLEN)

 #define err(code, fmt, arg...)			\
 	do {					\
 		fprintf(stderr, fmt, ##arg);	\
 		exit(code);			\
 	} while (0)

 int done;
 int rcvbufsz;
 char name[100];
 int dbg;
 int print_delays;
 int print_io_accounting;
 int print_task_context_switch_counts;
 __u64 stime, utime;

 #define PRINTF(fmt, arg...) {			\
 	    if (dbg) {				\
 		printf(fmt, ##arg);		\
 	    }					\
 	}

 /* Maximum size of response requested or message sent */
 #define MAX_MSG_SIZE	1024
 /* Maximum number of cpus expected to be specified in a cpumask */
 #define MAX_CPUS	32

 struct msgtemplate {
 	struct nlmsghdr n;
 	struct genlmsghdr g;
 	char buf[MAX_MSG_SIZE];
 };

 char cpumask[100+6*MAX_CPUS];

 static void usage(void)
 {
 	fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
 			"[-m cpumask] [-t tgid] [-p pid]\n");
 	fprintf(stderr, "  -d: print delayacct stats\n");
 	fprintf(stderr, "  -i: print IO accounting (works only with -p)\n");
 	fprintf(stderr, "  -l: listen forever\n");
 	fprintf(stderr, "  -v: debug on\n");
 	fprintf(stderr, "  -C: container path\n");
 }

 /*
  * Create a raw netlink socket and bind
  */
 static int create_nl_socket(int protocol)
 {
 	int fd;
 	struct sockaddr_nl local;

 	fd = socket(AF_NETLINK, SOCK_RAW, protocol);
 	if (fd < 0)
 		return -1;

 	if (rcvbufsz)
 		if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
 				&rcvbufsz, sizeof(rcvbufsz)) < 0) {
 			fprintf(stderr, "Unable to set socket rcv buf size "
 					"to %d\n",
 				rcvbufsz);
 			return -1;
 		}

 	memset(&local, 0, sizeof(local));
 	local.nl_family = AF_NETLINK;

 	if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
 		goto error;

 	return fd;
 error:
 	close(fd);
 	return -1;
 }


 int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
 	     __u8 genl_cmd, __u16 nla_type,
 	     void *nla_data, int nla_len)
 {
 	struct nlattr *na;
 	struct sockaddr_nl nladdr;
 	int r, buflen;
 	char *buf;

 	struct msgtemplate msg;

 	msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
 	msg.n.nlmsg_type = nlmsg_type;
 	msg.n.nlmsg_flags = NLM_F_REQUEST;
 	msg.n.nlmsg_seq = 0;
 	msg.n.nlmsg_pid = nlmsg_pid;
 	msg.g.cmd = genl_cmd;
 	msg.g.version = 0x1;
 	na = (struct nlattr *) GENLMSG_DATA(&msg);
 	na->nla_type = nla_type;
 	na->nla_len = nla_len + 1 + NLA_HDRLEN;
 	memcpy(NLA_DATA(na), nla_data, nla_len);
 	msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);

 	buf = (char *) &msg;
 	buflen = msg.n.nlmsg_len ;
 	memset(&nladdr, 0, sizeof(nladdr));
 	nladdr.nl_family = AF_NETLINK;
 	while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
 			   sizeof(nladdr))) < buflen) {
 		if (r > 0) {
 			buf += r;
 			buflen -= r;
 		} else if (errno != EAGAIN)
 			return -1;
 	}
 	return 0;
 }


 /*
  * Probe the controller in genetlink to find the family id
  * for the TASKSTATS family
  */
 int get_family_id(int sd)
 {
 	struct {
 		struct nlmsghdr n;
 		struct genlmsghdr g;
 		char buf[256];
 	} ans;

 	int id = 0, rc;
 	struct nlattr *na;
 	int rep_len;

 	strcpy(name, TASKSTATS_GENL_NAME);
 	rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
 			CTRL_ATTR_FAMILY_NAME, (void *)name,
 			strlen(TASKSTATS_GENL_NAME)+1);

 	rep_len = recv(sd, &ans, sizeof(ans), 0);
 	if (ans.n.nlmsg_type == NLMSG_ERROR ||
 	    (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
 		return 0;

 	na = (struct nlattr *) GENLMSG_DATA(&ans);
 	na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
 	if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
 		id = *(__u16 *) NLA_DATA(na);
 	}
 	return id;
 }

 void print_delayacct(struct taskstats *t)
 {
 	printf("\n\nCPU   %15s%15s%15s%15s\n"
 	       "      %15llu%15llu%15llu%15llu\n"
 	       "IO    %15s%15s\n"
 	       "      %15llu%15llu\n"
 	       "MEM   %15s%15s\n"
 	       "      %15llu%15llu\n",
 	       "count", "real total", "virtual total", "delay total",
 	       t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
 	       t->cpu_delay_total,
 	       "count", "delay total",
 	       t->blkio_count, t->blkio_delay_total,
 	       "count", "delay total", t->swapin_count, t->swapin_delay_total);
 }

 void task_context_switch_counts(struct taskstats *t)
 {
 	printf("\n\nTask   %15s%15s\n"
 	       "       %15llu%15llu\n",
 	       "voluntary", "nonvoluntary",
 	       t->nvcsw, t->nivcsw);
 }

 void print_cgroupstats(struct cgroupstats *c)
 {
 	printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
 		"uninterruptible %llu\n", c->nr_sleeping, c->nr_io_wait,
 		c->nr_running, c->nr_stopped, c->nr_uninterruptible);
 }


 void print_ioacct(struct taskstats *t)
 {
 	printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
 		t->ac_comm,
 		(unsigned long long)t->read_bytes,
 		(unsigned long long)t->write_bytes,
 		(unsigned long long)t->cancelled_write_bytes);
 }

 int main(int argc, char *argv[])
 {
 	int c, rc, rep_len, aggr_len, len2, cmd_type;
 	__u16 id;
 	__u32 mypid;

 	struct nlattr *na;
 	int nl_sd = -1;
 	int len = 0;
 	pid_t tid = 0;
 	pid_t rtid = 0;

 	int fd = 0;
 	int count = 0;
 	int write_file = 0;
 	int maskset = 0;
 	char *logfile = NULL;
 	int loop = 0;
 	int containerset = 0;
 	char containerpath[1024];
 	int cfd = 0;

 	struct msgtemplate msg;

 	while (1) {
 		c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:");
 		if (c < 0)
 			break;

 		switch (c) {
 		case 'd':
 			printf("print delayacct stats ON\n");
 			print_delays = 1;
 			break;
 		case 'i':
 			printf("printing IO accounting\n");
 			print_io_accounting = 1;
 			break;
 		case 'q':
 			printf("printing task/process context switch rates\n");
 			print_task_context_switch_counts = 1;
 			break;
 		case 'C':
 			containerset = 1;
 			strncpy(containerpath, optarg, strlen(optarg) + 1);
 			break;
 		case 'w':
 			logfile = strdup(optarg);
 			printf("write to file %s\n", logfile);
 			write_file = 1;
 			break;
 		case 'r':
 			rcvbufsz = atoi(optarg);
 			printf("receive buf size %d\n", rcvbufsz);
 			if (rcvbufsz < 0)
 				err(1, "Invalid rcv buf size\n");
 			break;
 		case 'm':
 			strncpy(cpumask, optarg, sizeof(cpumask));
 			maskset = 1;
 			printf("cpumask %s maskset %d\n", cpumask, maskset);
 			break;
 		case 't':
 			tid = atoi(optarg);
 			if (!tid)
 				err(1, "Invalid tgid\n");
 			cmd_type = TASKSTATS_CMD_ATTR_TGID;
 			break;
 		case 'p':
 			tid = atoi(optarg);
 			if (!tid)
 				err(1, "Invalid pid\n");
 			cmd_type = TASKSTATS_CMD_ATTR_PID;
 			break;
 		case 'v':
 			printf("debug on\n");
 			dbg = 1;
 			break;
 		case 'l':
 			printf("listen forever\n");
 			loop = 1;
 			break;
 		default:
 			usage();
 			exit(-1);
 		}
 	}

 	if (write_file) {
 		fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
 			  S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 		if (fd == -1) {
 			perror("Cannot open output file\n");
 			exit(1);
 		}
 	}

 	if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
 		err(1, "error creating Netlink socket\n");


 	mypid = getpid();
 	id = get_family_id(nl_sd);
 	if (!id) {
 		fprintf(stderr, "Error getting family id, errno %d\n", errno);
 		goto err;
 	}
 	PRINTF("family id %d\n", id);

 	if (maskset) {
 		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
 			      TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
 			      &cpumask, strlen(cpumask) + 1);
 		PRINTF("Sent register cpumask, retval %d\n", rc);
 		if (rc < 0) {
 			fprintf(stderr, "error sending register cpumask\n");
 			goto err;
 		}
 	}

 	if (tid && containerset) {
 		fprintf(stderr, "Select either -t or -C, not both\n");
 		goto err;
 	}

 	if (tid) {
 		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
 			      cmd_type, &tid, sizeof(__u32));
 		PRINTF("Sent pid/tgid, retval %d\n", rc);
 		if (rc < 0) {
 			fprintf(stderr, "error sending tid/tgid cmd\n");
 			goto done;
 		}
 	}

 	if (containerset) {
 		cfd = open(containerpath, O_RDONLY);
 		if (cfd < 0) {
 			perror("error opening container file");
 			goto err;
 		}
 		rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
 			      CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
 		if (rc < 0) {
 			perror("error sending cgroupstats command");
 			goto err;
 		}
 	}

 	do {
 		int i;

 		rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
 		PRINTF("received %d bytes\n", rep_len);

 		if (rep_len < 0) {
 			fprintf(stderr, "nonfatal reply error: errno %d\n",
 				errno);
 			continue;
 		}
 		if (msg.n.nlmsg_type == NLMSG_ERROR ||
 		    !NLMSG_OK((&msg.n), rep_len)) {
 			struct nlmsgerr *err = NLMSG_DATA(&msg);
 			fprintf(stderr, "fatal reply error,  errno %d\n",
 				err->error);
 			goto done;
 		}

 		PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
 		       sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);


 		rep_len = GENLMSG_PAYLOAD(&msg.n);

 		na = (struct nlattr *) GENLMSG_DATA(&msg);
 		len = 0;
 		i = 0;
 		while (len < rep_len) {
 			len += NLA_ALIGN(na->nla_len);
 			switch (na->nla_type) {
 			case TASKSTATS_TYPE_AGGR_TGID:
 				/* Fall through */
 			case TASKSTATS_TYPE_AGGR_PID:
 				aggr_len = NLA_PAYLOAD(na->nla_len);
 				len2 = 0;
 				/* For nested attributes, na follows */
 				na = (struct nlattr *) NLA_DATA(na);
 				done = 0;
 				while (len2 < aggr_len) {
 					switch (na->nla_type) {
 					case TASKSTATS_TYPE_PID:
 						rtid = *(int *) NLA_DATA(na);
 						if (print_delays)
 							printf("PID\t%d\n", rtid);
 						break;
 					case TASKSTATS_TYPE_TGID:
 						rtid = *(int *) NLA_DATA(na);
 						if (print_delays)
 							printf("TGID\t%d\n", rtid);
 						break;
 					case TASKSTATS_TYPE_STATS:
 						count++;
 						if (print_delays)
 							print_delayacct((struct taskstats *) NLA_DATA(na));
 						if (print_io_accounting)
 							print_ioacct((struct taskstats *) NLA_DATA(na));
 						if (print_task_context_switch_counts)
 							task_context_switch_counts((struct taskstats *) NLA_DATA(na));
 						if (fd) {
 							if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
 								err(1,"write error\n");
 							}
 						}
 						if (!loop)
 							goto done;
 						break;
 					default:
 						fprintf(stderr, "Unknown nested"
 							" nla_type %d\n",
 							na->nla_type);
 						break;
 					}
 					len2 += NLA_ALIGN(na->nla_len);
 					na = (struct nlattr *) ((char *) na + len2);
 				}
 				break;

 			case CGROUPSTATS_TYPE_CGROUP_STATS:
 				print_cgroupstats(NLA_DATA(na));
 				break;
 			default:
 				fprintf(stderr, "Unknown nla_type %d\n",
 					na->nla_type);
 				break;
 			}
 			na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
 		}
 	} while (loop);
 done:
 	if (maskset) {
 		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
 			      TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
 			      &cpumask, strlen(cpumask) + 1);
 		printf("Sent deregister mask, retval %d\n", rc);
 		if (rc < 0)
 			err(rc, "error sending deregister cpumask\n");
 	}
 err:
 	close(nl_sd);
 	if (fd)
 		close(fd);
 	if (cfd)
 		close(cfd);
 	return 0;
 }
	/* getdelays.c
	*
	* Utility to get per-pid and per-tgid delay accounting statistics
	* Also illustrates usage of the taskstats interface
	*
	* Copyright (C) Shailabh Nagar, IBM Corp. 2005
	* Copyright (C) Balbir Singh, IBM Corp. 2006
	* Copyright (c) Jay Lan, SGI. 2006
	*
	* Compile with
	* gcc -I/usr/src/linux/include getdelays.c -o getdelays
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <errno.h>
	#include <unistd.h>
	#include <poll.h>
	#include <string.h>
	#include <fcntl.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/socket.h>
	#include <signal.h>

	#include <linux/genetlink.h>
	#include <linux/taskstats.h>
	#include <linux/cgroupstats.h>

	/*
	* Generic macros for dealing with netlink sockets. Might be duplicated
	* elsewhere. It is recommended that commercial grade applications use
	* libnl or libnetlink and use the interfaces provided by the library
	*/
	#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
	#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
	#define NLA_DATA(na) ((void )((char)(na) + NLA_HDRLEN))
	#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)

	#define err(code, fmt, arg...) \
	do { \
	fprintf(stderr, fmt, ##arg); \
	exit(code); \
	} while (0)

	int done;
	int rcvbufsz;
	char name[100];
	int dbg;
	int print_delays;
	int print_io_accounting;
	int print_task_context_switch_counts;
	__u64 stime, utime;

	#define PRINTF(fmt, arg...) { \
	if (dbg) { \
	printf(fmt, ##arg); \
	} \
	}

	/* Maximum size of response requested or message sent */
	#define MAX_MSG_SIZE 1024
	/* Maximum number of cpus expected to be specified in a cpumask */
	#define MAX_CPUS 32

	struct msgtemplate {
	struct nlmsghdr n;
	struct genlmsghdr g;
	char buf[MAX_MSG_SIZE];
	};

	char cpumask[100+6*MAX_CPUS];

	static void usage(void)
	{
	fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
	"[-m cpumask] [-t tgid] [-p pid]\n");
	fprintf(stderr, " -d: print delayacct stats\n");
	fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
	fprintf(stderr, " -l: listen forever\n");
	fprintf(stderr, " -v: debug on\n");
	fprintf(stderr, " -C: container path\n");
	}

	/*
	* Create a raw netlink socket and bind
	*/
	static int create_nl_socket(int protocol)
	{
	int fd;
	struct sockaddr_nl local;

	fd = socket(AF_NETLINK, SOCK_RAW, protocol);
	if (fd < 0)
	return -1;

	if (rcvbufsz)
	if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
	&rcvbufsz, sizeof(rcvbufsz)) < 0) {
	fprintf(stderr, "Unable to set socket rcv buf size "
	"to %d\n",
	rcvbufsz);
	return -1;
	}

	memset(&local, 0, sizeof(local));
	local.nl_family = AF_NETLINK;

	if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
	goto error;

	return fd;
	error:
	close(fd);
	return -1;
	}


	int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
	__u8 genl_cmd, __u16 nla_type,
	void *nla_data, int nla_len)
	{
	struct nlattr *na;
	struct sockaddr_nl nladdr;
	int r, buflen;
	char *buf;

	struct msgtemplate msg;

	msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
	msg.n.nlmsg_type = nlmsg_type;
	msg.n.nlmsg_flags = NLM_F_REQUEST;
	msg.n.nlmsg_seq = 0;
	msg.n.nlmsg_pid = nlmsg_pid;
	msg.g.cmd = genl_cmd;
	msg.g.version = 0x1;
	na = (struct nlattr *) GENLMSG_DATA(&msg);
	na->nla_type = nla_type;
	na->nla_len = nla_len + 1 + NLA_HDRLEN;
	memcpy(NLA_DATA(na), nla_data, nla_len);
	msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);

	buf = (char *) &msg;
	buflen = msg.n.nlmsg_len ;
	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;
	while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
	sizeof(nladdr))) < buflen) {
	if (r > 0) {
	buf += r;
	buflen -= r;
	} else if (errno != EAGAIN)
	return -1;
	}
	return 0;
	}


	/*
	* Probe the controller in genetlink to find the family id
	* for the TASKSTATS family
	*/
	int get_family_id(int sd)
	{
	struct {
	struct nlmsghdr n;
	struct genlmsghdr g;
	char buf[256];
	} ans;

	int id = 0, rc;
	struct nlattr *na;
	int rep_len;

	strcpy(name, TASKSTATS_GENL_NAME);
	rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
	CTRL_ATTR_FAMILY_NAME, (void *)name,
	strlen(TASKSTATS_GENL_NAME)+1);

	rep_len = recv(sd, &ans, sizeof(ans), 0);
	if (ans.n.nlmsg_type == NLMSG_ERROR \|\|
	(rep_len < 0) \|\| !NLMSG_OK((&ans.n), rep_len))
	return 0;

	na = (struct nlattr *) GENLMSG_DATA(&ans);
	na = (struct nlattr ) ((char ) na + NLA_ALIGN(na->nla_len));
	if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
	id = (__u16 ) NLA_DATA(na);
	}
	return id;
	}

	void print_delayacct(struct taskstats *t)
	{
	printf("\n\nCPU %15s%15s%15s%15s\n"
	" %15llu%15llu%15llu%15llu\n"
	"IO %15s%15s\n"
	" %15llu%15llu\n"
	"MEM %15s%15s\n"
	" %15llu%15llu\n",
	"count", "real total", "virtual total", "delay total",
	t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
	t->cpu_delay_total,
	"count", "delay total",
	t->blkio_count, t->blkio_delay_total,
	"count", "delay total", t->swapin_count, t->swapin_delay_total);
	}

	void task_context_switch_counts(struct taskstats *t)
	{
	printf("\n\nTask %15s%15s\n"
	" %15llu%15llu\n",
	"voluntary", "nonvoluntary",
	t->nvcsw, t->nivcsw);
	}

	void print_cgroupstats(struct cgroupstats *c)
	{
	printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
	"uninterruptible %llu\n", c->nr_sleeping, c->nr_io_wait,
	c->nr_running, c->nr_stopped, c->nr_uninterruptible);
	}


	void print_ioacct(struct taskstats *t)
	{
	printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
	t->ac_comm,
	(unsigned long long)t->read_bytes,
	(unsigned long long)t->write_bytes,
	(unsigned long long)t->cancelled_write_bytes);
	}

	int main(int argc, char *argv[])
	{
	int c, rc, rep_len, aggr_len, len2, cmd_type;
	__u16 id;
	__u32 mypid;

	struct nlattr *na;
	int nl_sd = -1;
	int len = 0;
	pid_t tid = 0;
	pid_t rtid = 0;

	int fd = 0;
	int count = 0;
	int write_file = 0;
	int maskset = 0;
	char *logfile = NULL;
	int loop = 0;
	int containerset = 0;
	char containerpath[1024];
	int cfd = 0;

	struct msgtemplate msg;

	while (1) {
	c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:");
	if (c < 0)
	break;

	switch (c) {
	case 'd':
	printf("print delayacct stats ON\n");
	print_delays = 1;
	break;
	case 'i':
	printf("printing IO accounting\n");
	print_io_accounting = 1;
	break;
	case 'q':
	printf("printing task/process context switch rates\n");
	print_task_context_switch_counts = 1;
	break;
	case 'C':
	containerset = 1;
	strncpy(containerpath, optarg, strlen(optarg) + 1);
	break;
	case 'w':
	logfile = strdup(optarg);
	printf("write to file %s\n", logfile);
	write_file = 1;
	break;
	case 'r':
	rcvbufsz = atoi(optarg);
	printf("receive buf size %d\n", rcvbufsz);
	if (rcvbufsz < 0)
	err(1, "Invalid rcv buf size\n");
	break;
	case 'm':
	strncpy(cpumask, optarg, sizeof(cpumask));
	maskset = 1;
	printf("cpumask %s maskset %d\n", cpumask, maskset);
	break;
	case 't':
	tid = atoi(optarg);
	if (!tid)
	err(1, "Invalid tgid\n");
	cmd_type = TASKSTATS_CMD_ATTR_TGID;
	break;
	case 'p':
	tid = atoi(optarg);
	if (!tid)
	err(1, "Invalid pid\n");
	cmd_type = TASKSTATS_CMD_ATTR_PID;
	break;
	case 'v':
	printf("debug on\n");
	dbg = 1;
	break;
	case 'l':
	printf("listen forever\n");
	loop = 1;
	break;
	default:
	usage();
	exit(-1);
	}
	}

	if (write_file) {
	fd = open(logfile, O_WRONLY \| O_CREAT \| O_TRUNC,
	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IROTH);
	if (fd == -1) {
	perror("Cannot open output file\n");
	exit(1);
	}
	}

	if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
	err(1, "error creating Netlink socket\n");


	mypid = getpid();
	id = get_family_id(nl_sd);
	if (!id) {
	fprintf(stderr, "Error getting family id, errno %d\n", errno);
	goto err;
	}
	PRINTF("family id %d\n", id);

	if (maskset) {
	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
	&cpumask, strlen(cpumask) + 1);
	PRINTF("Sent register cpumask, retval %d\n", rc);
	if (rc < 0) {
	fprintf(stderr, "error sending register cpumask\n");
	goto err;
	}
	}

	if (tid && containerset) {
	fprintf(stderr, "Select either -t or -C, not both\n");
	goto err;
	}

	if (tid) {
	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	cmd_type, &tid, sizeof(__u32));
	PRINTF("Sent pid/tgid, retval %d\n", rc);
	if (rc < 0) {
	fprintf(stderr, "error sending tid/tgid cmd\n");
	goto done;
	}
	}

	if (containerset) {
	cfd = open(containerpath, O_RDONLY);
	if (cfd < 0) {
	perror("error opening container file");
	goto err;
	}
	rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
	CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
	if (rc < 0) {
	perror("error sending cgroupstats command");
	goto err;
	}
	}

	do {
	int i;

	rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
	PRINTF("received %d bytes\n", rep_len);

	if (rep_len < 0) {
	fprintf(stderr, "nonfatal reply error: errno %d\n",
	errno);
	continue;
	}
	if (msg.n.nlmsg_type == NLMSG_ERROR \|\|
	!NLMSG_OK((&msg.n), rep_len)) {
	struct nlmsgerr *err = NLMSG_DATA(&msg);
	fprintf(stderr, "fatal reply error, errno %d\n",
	err->error);
	goto done;
	}

	PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
	sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);


	rep_len = GENLMSG_PAYLOAD(&msg.n);

	na = (struct nlattr *) GENLMSG_DATA(&msg);
	len = 0;
	i = 0;
	while (len < rep_len) {
	len += NLA_ALIGN(na->nla_len);
	switch (na->nla_type) {
	case TASKSTATS_TYPE_AGGR_TGID:
	/* Fall through */
	case TASKSTATS_TYPE_AGGR_PID:
	aggr_len = NLA_PAYLOAD(na->nla_len);
	len2 = 0;
	/* For nested attributes, na follows */
	na = (struct nlattr *) NLA_DATA(na);
	done = 0;
	while (len2 < aggr_len) {
	switch (na->nla_type) {
	case TASKSTATS_TYPE_PID:
	rtid = (int ) NLA_DATA(na);
	if (print_delays)
	printf("PID\t%d\n", rtid);
	break;
	case TASKSTATS_TYPE_TGID:
	rtid = (int ) NLA_DATA(na);
	if (print_delays)
	printf("TGID\t%d\n", rtid);
	break;
	case TASKSTATS_TYPE_STATS:
	count++;
	if (print_delays)
	print_delayacct((struct taskstats *) NLA_DATA(na));
	if (print_io_accounting)
	print_ioacct((struct taskstats *) NLA_DATA(na));
	if (print_task_context_switch_counts)
	task_context_switch_counts((struct taskstats *) NLA_DATA(na));
	if (fd) {
	if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
	err(1,"write error\n");
	}
	}
	if (!loop)
	goto done;
	break;
	default:
	fprintf(stderr, "Unknown nested"
	" nla_type %d\n",
	na->nla_type);
	break;
	}
	len2 += NLA_ALIGN(na->nla_len);
	na = (struct nlattr ) ((char ) na + len2);
	}
	break;

	case CGROUPSTATS_TYPE_CGROUP_STATS:
	print_cgroupstats(NLA_DATA(na));
	break;
	default:
	fprintf(stderr, "Unknown nla_type %d\n",
	na->nla_type);
	break;
	}
	na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
	}
	} while (loop);
	done:
	if (maskset) {
	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
	&cpumask, strlen(cpumask) + 1);
	printf("Sent deregister mask, retval %d\n", rc);
	if (rc < 0)
	err(rc, "error sending deregister cpumask\n");
	}
	err:
	close(nl_sd);
	if (fd)
	close(fd);
	if (cfd)
	close(cfd);
	return 0;
	}